Journal
CHEMSUSCHEM
Volume 7, Issue 3, Pages 866-874Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300934
Keywords
cyclic voltammetry; nanoparticles; silver; supported catalysts; titanium
Funding
- Department of Energy through an STTR grant [DE-SC0004453]
- International Institute of Carbon Neutral Energy Research [WPI-I2CNER]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
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Although significant research efforts have focused on the exploration of catalysts for the electrochemical reduction of CO2, considerably fewer reports have described how support materials for these catalysts affect their performance, which includes their ability to reduce the overpotential, and/or to increase the catalyst utilization and selectivity. Here Ag nanoparticles supported on carbon black (Ag/C) and on titanium dioxide (Ag/TiO2) were synthesized. In a flow reactor, 40wt% Ag/TiO2 exhibited a twofold higher current density for CO production than 40wt% Ag/C. Faradaic efficiencies of the 40wt% Ag/TiO2 catalyst exceeded 90% with a partial current density for CO of 101mAcm(-2); similar to the performance of unsupported Ag nanoparticle catalysts (AgNP) but at a 2.5times lower Ag loading. A mass activity as high as 2700mAmg(Ag)(-1)cm(-2) was achieved. In cyclic voltammetry tests in a three-electrode cell, Ag/TiO2 exhibited a lower overpotential for CO2 reduction than AgNP, which, together with other data, suggests that TiO2 stabilizes the intermediate and serves as redox electron carrier to assist CO2 reduction while Ag assists in the formation of the final product, CO.
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